856646171660 has 12 divisors (see below), whose sum is σ = 1798956960528. Its totient is φ = 342658468656.

The previous prime is 856646171653. The next prime is 856646171687. The reversal of 856646171660 is 66171646658.

It is a junction number, because it is equal to n+sod(n) for n = 856646171596 and 856646171605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21416154272 + ... + 21416154311.

It is an arithmetic number, because the mean of its divisors is an integer number (149913080044).

Almost surely, 2^856646171660 is an apocalyptic number.

It is an amenable number.

856646171660 is an abundant number, since it is smaller than the sum of its proper divisors (942310788868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856646171660 is a wasteful number, since it uses less digits than its factorization.

856646171660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42832308592 (or 42832308590 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 856646171660 in words is "eight hundred fifty-six billion, six hundred forty-six million, one hundred seventy-one thousand, six hundred sixty".